nvme currently will synchronize queue quiesce for each namespace at once. This can slow down failover time (which first quiesce all ns queues) if we have a large amount of namespaces. Instead, we want to use an async interface and do the namespaces quiesce in parallel rather than serially. Signed-off-by: Sagi Grimberg <sagi@xxxxxxxxxxx> --- drivers/nvme/host/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 05aa568a60af..e8cc728dee46 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4561,7 +4561,9 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl) down_read(&ctrl->namespaces_rwsem); list_for_each_entry(ns, &ctrl->namespaces, list) - blk_mq_quiesce_queue(ns->queue); + blk_mq_quiesce_queue_async(ns->queue); + list_for_each_entry(ns, &ctrl->namespaces, list) + blk_mq_quiesce_queue_async_wait(ns->queue); up_read(&ctrl->namespaces_rwsem); } EXPORT_SYMBOL_GPL(nvme_stop_queues); -- 2.25.1
